VanTay HaiNam HaTien Lab1

7/29/2019 VanTay HaiNam HaTien Lab1

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Group 1

REPORT LABORATORY 1

Nguyn Vn TyH Hi Nam

Don H Tin


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Report Laboratory 1December 25, 2012

EE47209ECEVan TayHai NamHa Tien

Introduction to the Lab Environment

Danang University of TechnologyAdvanced Program in Digital Systems

Ho Viet Viet, Pham Xuan Trung, Nguyen The Nghia

1. Objectives:This lab will give the step by step procedures on creating C language and assembly

language programs in Code Composer Studio that are executed on the MSP-

EXP430FG4618 experimenter board.

2. Procedure 1: Introduction to CCS in generating a C language program1. Double click on the CCS icon and start execution of code composer studio. The default

location of where the projects are stored is given and can be changed to

another location. Use the default location given.

2. To create a new project, select from the File menu, New and then CCS Project(File -> New -> CCS Project).

3. Select the desired project name and the desired version of the MSP430. For theexperimenter board its the MSP430FG4618. Also select the type of project: Empty C

program, a Hello World C program, or an Assembly Language program. For this step,

choose the Hello World program.

4. Highlighting the project makes it the activedebug project. Also, clicking on the leftarrow opens all of the subdirectories and files associated with the project. Selecting

main.c will open the C language source file.


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Create a New CCS Project

Makes Project the ActiveDebug Project


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5. To use the printf function in C, the reserved number of bytes for the stack and the heapmust be increased from 80 to a minimum of 500 bytes. Open under the Project

menu the Project Properties and under Basic Linker Options change the heap and

stack memory size to 500.

The default printf option is set to minimum which only allows strings to be

printed. To print integer or floating point variables this option must be changed and it

is located under MSP430 Compiler Advanced options. The options are minimum

support, no floating variable support, or full support. Full support uses the most

program memory while minimum uses the least program memory.

6. To build and compile a project, select the Project menu and then the BuildProject option. CCS will then build the project and indicate if there are any errors that

need to be corrected.Notes: When we build a project, it may contain some errors such as:

- If you use operating systems like window vista or higher, we need to set the useraccount in Control Panel to lowest level to avoid a user error in building project.

- If you create an assembly project, you need to change the output format inproject properties into legacy COFF - Common Object File Format, which is a

specification of a format forexecutable, object code, and shared

library computer filesused on Unix systems.
http://en.wikipedia.org/wiki/File_formathttp://en.wikipedia.org/wiki/Executablehttp://en.wikipedia.org/wiki/Object_codehttp://en.wikipedia.org/wiki/Shared_librarieshttp://en.wikipedia.org/wiki/Shared_librarieshttp://en.wikipedia.org/wiki/Computer_filehttp://en.wikipedia.org/wiki/Unixhttp://en.wikipedia.org/wiki/Unixhttp://en.wikipedia.org/wiki/Computer_filehttp://en.wikipedia.org/wiki/Shared_librarieshttp://en.wikipedia.org/wiki/Shared_librarieshttp://en.wikipedia.org/wiki/Object_codehttp://en.wikipedia.org/wiki/Executablehttp://en.wikipedia.org/wiki/File_format


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7. To debug a project, the debug option must be selected under the Run menu andthe experimenter board must be connected to the computer. The Build Project

and Debug options should be selected every time the program source code changes.

Notes: To debug a project, we need to build the project successfully. If we debug the

project and it occurs errors, you may need to check the building file again.

8. To execute the program, the Resume option under the Run menu is selected.The console window should now display the Hello World message.

9. To quit the program, the Terminate option under the Run menu is selected.10.Also available for debugging is the ability of stepping through the program one

line at a time. F5 (Step Into) executes the program one line at a time. F6 (Step

Over) executes the various functions and subroutines but does not trace them one line

at a time. The F5 option traces even subroutines and functions.

Note:

- We need to add one more command in the Hello World Program to stopwatchdog timer. Since without the command, the program will run infinitely due

to continuously resetting of the MSP430.

- A watchdog timer (or computer operating properly (COP) timer) isa computerhardware or software timerthat triggers a system reset or other

corrective action if the main program, due to some fault condition such as

a hang, neglects to regularly service the watchdog by writing a "service pulse"

to it.
http://en.wikipedia.org/wiki/Computerhttp://en.wikipedia.org/wiki/Timerhttp://en.wikipedia.org/wiki/Reset_(computing)http://en.wikipedia.org/wiki/Computer_programhttp://en.wikipedia.org/wiki/Hang_(computing)http://en.wikipedia.org/wiki/Hang_(computing)http://en.wikipedia.org/wiki/Computer_programhttp://en.wikipedia.org/wiki/Reset_(computing)http://en.wikipedia.org/wiki/Timerhttp://en.wikipedia.org/wiki/Computer


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11.Add the following for(;;) to allow the program to run indefinitely. Build the project,debug the project, and then trace then program one line at a time using the Step Into

option (F5). Note how the program continuously loops printing the Hello WorldMessage

F5 at the Loop 1 time

F5 at the Loop 2 times


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12.Next, create a new project that has an empty file. This creates an empty Cprogram template. Make sure to click on this project name in the Project Explorer

windows so this project is the Active-Debug project.


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13.Next, types the following C program into the blank main.c file under the desired theActive-Debug project. Read the comments contained in this program, as these

comments cover in detail the purpose of each line of code. The definition for each

variable is defined in the included file for the MSP430FG4618 #include

msp430fg4618.h. The notation for the MSP430 for a port is PX.Y where X isthe port number and Y is the bit. Port 2 bit 2 is the green LED and Port 2 bit 1 is

the yellow LED. All ports also have three variables associated with the port: the

direction control PXDIR, the input PXIN, and the output PXOUT. For a

port bit to be an output, its value must be 1 in the direction control variable. If its azero, then the bit is an input pin.

To set a bit to a one on a port, the program sets this bit in PXOUT to a one. To read an

input bit on a port, the PXIN variable is used. For example, to read the status of the two

push buttons on the experimenter board, (input buttons on port 1 bits SW1 = bit 0 and

SW2 = bit 1), the variable P1IN is used. A value of 1 indicates that the appropriate

switch is not pressed and a value of zero indicates the switch is pressed.

Answers:

After typing the C program, we get the pure-comment code:

Execute the blinking LED program using the Resume menu option under the Run

menu. Take note that the LED is blinking on the experimenter board. Terminate the

program and re-run the program using the step into menu option (F5) executing one

line at a time. Once the program is at the line that the for loop is on, highlight the

variable i with the mouse and observe the value of i indicated. Every time the program

executes this line the value of i is incremented.

#include"msp430fg4618.h"

intmain(void)

{

volatileunsignedint i;

WDTCTL = WDTPW + WDTHOLD;

P2DIR |= 0x02;

P2OUT=0x02;

for (;;){

for(i=0;i


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F5 at the Loop 1 time



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Notes: When we step into (F5) at the for loop, we will observe the increment of variable

i. In the figures, i increases from 1 (decimal) to 3 (decimal).

3. Procedure 2 - Introduction to CCS in generating an assembly language program1. To create an assembly language program, the same steps are used as creating a C-

language program. But for an assembly language program, an empty assembly-only-

project is selected.


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2. Next, under the File menu, select New and then Other. Under the General option, selectthe File option, and then the Next button. Choose a name for the blank assemble

language project. Also make sure the desired project name for the assembly language

file is selected as the parent folder. Make sure that the file extension is *.asm so the

CCS knows that this is an assembly language file. Finally, click the finished button.

Create an Assembly File

Name the Assembly File


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3. Type in the following assembly language program to make the LED lights flash. Buildthe project as done for a C-language project by selecting under the Project menu the

Build Project option (PROJECT-> Build project). Read the comments contained in this

program as these comments cover in detail the purpose of each line of code. The

definitions for each variable are defined in the included file for the MSP430FG4618

#include msp430fg4618.h. The notation for the MSP430 for a port is PX.Y where Xis the port number and Y is the bit. Port 2 bit 2 is the green LED and Port 2 bit 1 is the

yellow LED. All ports also have three variables associated with the port: the direction

control PXDIR, the input PXIN, and the output PXOUT. For a port bit to be an output

its value must be 1 in the direction control variable. If its a zero, then the bit is aninput pin.

Answers:

After typing the C program, we get the pure-comment code:

4. Next, debug this project using the Debug option under the Run menu. Finally, executethis project using Resume option under the RUN menu. As with the C language

program the Step-Into (F5) and the Step-Over (F6) options can be used to execute one

line of instructions at a time. To help in the debugging of an assembly language

program, there are several windows available in CCS. These windows are available

under the VIEW menu. The first is the Disassembly window. This window gives the

assembled code listing file. It gives the assembly language instruction along with the

machine code generated for each instruction and the location in program flash memory

where the instructions are located.

The next window that is commonly used in debugging an assembly language

program is the Memory Browser window. The user must enter a memory address

to view. For example, if 0x3100 is chosen, the memory browser window displays

the machine code of the assembly instructions.

The last window that is used for debugging a program is the Register window.This window allows the user to view the MSP430 registers and the various states of the

MSP430 I/O devices. Clicking on the Core Register arrow gives the MSP430 registers.

.cdecls C,LIST,"msp430fg4618.h"

.text

.globalSTART

START mov.w #0x300,SP

StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL

SetupP1 bis.b #0x04,&P2DIR

Mainloop xor.b #0x04,&P2OUT

mov.w #0xA000,R7

L1 dec.w R7jnz L1

jmp Mainloop

.sect".reset"

.shortSTART

.end


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Disassembly Window

Memory Browser Window

Register Window


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5. Modify the assembly language program to load a value of 0x0005 into register R7.Build the project and then debug this project. Next, trace through each line of the code

using the Step Into option observing the register values as each line of code is executed.

In particular, take note how R7 starts with a value 0x0005 and decreases in value until

it reaches zero.

Answers:

After load a value of 0x0005 into register R7, we trace each line to see decrement of R7

Current Value of R7 is 0x0005

Decreasing by 1 into 0x0004


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Decreasing by 1 into 0x0003

And then into 0x0002

4. Procedure 3 - Additional Programs to be written and executed1. Modify and execute the C-language program so that both the green and yellow LEDs

blink alternatively on and off about once every second. For one second, the green LED

is on and the yellow LED is off. For the next second, the green LED is off and

the yellow LED is on. Adjust the value used in the delay loop to obtain the

correct timing. Make sure that this program is properly commented. An

additional for loop may be needed to obtain the desired timing. Make sure to have

the lab assistant verify the functionality of this program.

Answers:


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Source Code:

2. Repeat step 1, but this time modify and execute the assembly language program.An additional loop may be needed to obtain the desired timing for second on and one

second off.

Answers:

Source Code:


.text

.globalSTART

START mov.w #0x300,SP ; Initialize '0x1200 or

; 0x300 stackpointer

; Turn off the watchdog time so the program can run indefinitely

StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT


intmain(void)

{

volatilelongunsignedint i, j;

WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer so the program

// runs indefinitely

P2DIR |= 0x06; // Set port 2 bit 1 & bit 2 as outputs

// 1 = output 0 = input

// turn the green light on, the yellow light off.

P2OUT=0x04;

// go run the program forever

for (;;){

// delay before turning changing the state of the LED (about 1s)

for(i=0;i


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; Set port 2 bit 1 and bit 2 direction so that P2.1 and P2.2 are outputs

SetupP1 bis.b #0x06,&P2DIR ; P2.1 and P2.2 direction = 1

; Set port P2.2 to a one to turn on the Green LED

mov.w #0x04,&P2OUTMainloop xor.b #0x06,&P2OUT ; Toggle P2.1 and P2.2

; Move the value of 0xFFFF into register 7 so to create a delay

mov.w #0xFFFF,R7 ; Delay with a loop is not

; the best way; interrupts

; are better given in Lab 6

; Decrement register 7 until its zero. Stay in this loop until

; register 7 is zero

L1 dec.w R7 ; Decrement R7

jnz L1 ; Delay over?

; Use more similar loops to create longer delay (about 1s)

mov.w #0xFFFF,R7



mov.w #0xFFFF,R7



mov.w #0xFFFF,R7



; Lets run the program forever

jmp Mainloop ; Again

.sect".reset"

.shortSTART

.end


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3. Write a C-language program that turns on the green LED when SW1 on theexperimenter board is pressed and the yellow LED when SW2 is pressed.

Execute this program and verify that it is running correctly. Make sure that this

program is properly commented. Make sure to have the lab assistant verify the

functionality of this program.

Answers:

Source Code:

4. Repeat step 3, but this time writes an assembly language program to turn onand off the green and yellow LEDs.

Answers:

Source Code:


intmain(void){// tell the compiler not to optimize the variable i, otherwise the// compiler may change how the variable is used

volatileunsignedint i;

WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer so the program// runs indefinitely

P2DIR |= 0x06; // Set port 2 bit 1 and bit 2 to as outputsP1IN |= 0x03; // Set port 1 bit 0 and bit 1 to as inputs

// go run the program foreverfor (;;){

if(P1IN==0x01){ // Sw2 pressed = Yellow led onP2OUT=0x02;

} elseif (P1IN==0x02){ // Sw1 pressed = Green led onP2OUT=0x04;

} elseif (P1IN==0x00){ // Both switch pressed = Two leds onP2OUT=0x06;

} else {P2OUT=0x00; // No switch pressed = No led on

}

}}


.text

.globalSTART

START mov.w #0x300,SPStopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT


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; Set port 2 bit 1 and bit 2 direction so that P2.1 and P2.2 are outputs

; Set port 1 bit 0 and bit 1 direction so that P1.0 and P1.1 are inputs

SetupP1 bis.b #0x06,&P2DIR

bis.b #0x03,&P1IN

Mainloop cmp #0x00,&P1IN ; compare to check which switch is pressedjeq Both_On ; if both switches are pressed, jump Both_On

cmp #0x01,&P1INjeq Yellow_On ; if switch 2 is pressed, jump Yellow_On

cmp #0x02,&P1INjeq Green_On ; if switch 1 is pressed, jump Green_On

cmp #0x03,&P1INjeq Both_Off ; if no switch is pressed, jump Both_Off

Both_On mov.w #0x06,&P2OUT ; turn on two leds.jmp Mainloop

Green_On mov.w #0x04,&P2OUT ; turn on Green led.jmp Mainloop

Yellow_On mov.w #0x02,&P2OUT ; turn on Yellow led.jmp Mainloop

Both_Off mov.w #0x00,&P2OUT ; turn off both leds.jmp Mainloop

.sect".reset"

.shortSTART

.end

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VanTay HaiNam HaTien Lab1